Biostratigraphy, depositional environment and sequence stratigraphy of Late Cretaceous clastic-evaporite-carbonate deposits, east of Central Iran, Bajestan

Twenty four facies have been identified including six siliciclastic lithofacies belong to oxygenated coastal belt-tidal flat consists of 1-Gcm lithofacies as beach channel fill 2-3-two sandstone lithofacies belongs to shoreface and offshore transition 4-siltstone lithofacies belongs to offshore and supratidal 5-6-two shale lithofacies consist of shale devoid of fossils belongs to supratidal and shale with foraminifera belongs to shallow open marine, one evaporative lithofacies belongs to saline, seventeen carbonate faciesfrom sea toward land consist of nine facies most of them micritic belong to open marine, two grain stone facies belong to barrier, five miliolid, ostracoda and peloid facies belong to lagoon and one marl with no fossils facies belongs to supratidal. In general, the main objectives of this study are: 1- Determining relative age of these deposits using foraminifera and calcareous alga (carbonate part) as well as their stratigraphic position (evaporite and silici-clastic parts) 2- Identifying and analyzing facies and also checking vertical and horizontal changes of facies 3- Interpreting depositional paleo environment and offering depositional model 4- Identifying depositional sequences and sequence boundaries by using fossils and other data and comparing sea level fluctuation at the time of deposition with global eustatic curve of Haq et al. [...]based on the studies conducted, 9 genera and 12 species of benthic foraminifera, 1 genus of planktonic foraminifera and 1 genus and 4 species of calcareous algae were identified in the sediments as follows (Figs. 2-3). According to studies conducted by Haq et al.